/*
 * Copyright 2010-2016 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jetbrains.kotlin.ir.declarations

import org.jetbrains.kotlin.descriptors.FunctionDescriptor
import org.jetbrains.kotlin.descriptors.ValueParameterDescriptor
import org.jetbrains.kotlin.ir.expressions.IrBody
import org.jetbrains.kotlin.ir.expressions.IrExpressionBody
import org.jetbrains.kotlin.ir.symbols.IrFunctionSymbol
import org.jetbrains.kotlin.ir.symbols.IrSimpleFunctionSymbol

interface IrFunction : IrDeclaration, IrTypeParametersContainer, IrSymbolOwner {
    override val descriptor: FunctionDescriptor
    override val symbol : IrFunctionSymbol

    var dispatchReceiverParameter: IrValueParameter?
    var extensionReceiverParameter: IrValueParameter?
    val valueParameters: MutableList<IrValueParameter>

    var body: IrBody?
}


interface IrSimpleFunction : IrFunction, IrSymbolDeclaration<IrSimpleFunctionSymbol> {
    override val declarationKind: IrDeclarationKind
        get() = IrDeclarationKind.FUNCTION
}

fun IrFunction.getIrValueParameter(parameter: ValueParameterDescriptor): IrValueParameter =
        valueParameters.getOrElse(parameter.index) {
            throw AssertionError("No IrValueParameter for $parameter")
        }.also { found ->
            assert(found.descriptor == parameter) {
                "Parameter indices mismatch at $descriptor: $parameter != ${found.descriptor}"
            }
        }

fun IrFunction.getDefault(parameter: ValueParameterDescriptor): IrExpressionBody? =
        getIrValueParameter(parameter).defaultValue

fun IrFunction.putDefault(parameter: ValueParameterDescriptor, expressionBody: IrExpressionBody) {
    getIrValueParameter(parameter).defaultValue = expressionBody
}
